Wisconsin 2025-2026 Regular Session

Wisconsin Assembly Bill AB431

Introduced
9/15/25  

Caption

Special motions to strike strategic lawsuits against public participation. (FE)

Impact

The introduction of AB431 is significant as it alters the landscape of civil litigation concerning public discourse. The bill aims to provide legal protections for individuals speaking out on matters of public concern, which is particularly relevant in an era of increasing concerns about freedom of speech. The law would prevent the courts from favoring plaintiffs in these situations unless they show a likelihood of winning the case, thereby changing the burden of proof that typically favors the initial complainant. This shift can potentially decrease the number of frivolous lawsuits aimed at suppressing vocal opposition or criticism from citizens and activists.

Summary

Assembly Bill 431 (AB431) proposes the introduction of special motions to strike strategic lawsuits against public participation in Wisconsin. This bill allows individuals to file a special motion to dismiss cases that limit their rights to petition or free speech, particularly regarding public issues. If such a motion is successful, it facilitates the dismissal of the lawsuit, thereby protecting citizens from being silenced through legal intimidation. The foundation of this legislation is rooted in the First Amendment rights, ensuring that robust discourse and public participation are not stifled by the threat of legal action.

Contention

Despite its protective intent, the bill has faced criticism. Opponents may argue that while the bill aims to safeguard free expression, it could inadvertently provide a shield for individuals spreading misinformation under the guise of protected speech. Additionally, there are concerns about how this legislation might affect legitimate claims of defamation and other forms of harm that could arise from public discourse. The inclusion of attorney fees for successful motions emphasizes the need to protect individuals from costly legal battles, but critics fear this could lead to discourage legitimate litigation meant to hold parties accountable for slanderous acts.

Companion Bills

No companion bills found.

Previously Filed As

WI SB414

Special motions to strike strategic lawsuits against public participation. (FE)

WI AB423

Special motions to strike strategic lawsuits against public participation. (FE)

WI SB1092

Restoring private individual authority to bring a qui tam claim against a person for making a false claim for medical assistance, actions by the attorney general against a person for making a false claim for medical assistance, and providing a penalty. (FE)

WI AB1186

Restoring private individual authority to bring a qui tam claim against a person for making a false claim for medical assistance, actions by the attorney general against a person for making a false claim for medical assistance, and providing a penalty. (FE)

WI SB275

Statutory recognition of specialized treatment court and commercial court dockets.

WI AB280

Statutory recognition of specialized treatment court and commercial court dockets.

WI AB553

Free speech and academic freedom at University of Wisconsin System institutions and technical colleges, due process in disciplinary proceedings at University of Wisconsin System institutions and technical colleges, Wisconsin grant funding allocation, and causes of action against the Board of Regents of the University of Wisconsin System and technical college district boards. (FE)

WI SB575

Free speech and academic freedom at University of Wisconsin System institutions and technical colleges, due process in disciplinary proceedings at University of Wisconsin System institutions and technical colleges, Wisconsin grant funding allocation, and causes of action against the Board of Regents of the University of Wisconsin System and technical college district boards. (FE)

WI AB895

Creating a civil cause of action against the owner or operator of a social media website that restricts religious or political speech. (FE)

WI SB856

Specialized transportation assistance pilot program. (FE)

Similar Bills

CA AB2129

Civil procedure: special motion to strike.

CA AB2232

Accessibility to emergency information and services: emergency shelters: persons with pets.

MI SB0997

Civil procedure: remedies; wrongful imprisonment compensation act; modify evidence requirements. Amends secs. 2, 4, 5 & 7 of 2016 PA 343 (MCL 691.1752 et seq.).

MI HB5431

Civil procedure: remedies; wrongful imprisonment compensation act; modify evidence requirements. Amends secs. 2, 4, 5 & 7 of 2016 PA 343 (MCL 691.1752 et seq.).

CA AB1730

Regional transportation plans: San Diego Association of Governments: housing.

CA SB224

Personal rights: civil liability and enforcement.

CA SB439

Special motions to strike: priority housing development projects.

WI SB414

Special motions to strike strategic lawsuits against public participation. (FE)